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Hello Volodymyr,

You have two options:
1. When you create your VIP, simply put in your external network as
the vip-subnet-id or vip-network-id. This will allocate a public IP to
the VIP.
2. Use neutron to assign a floating IP to the VIP address of the load
balancer.  From your example, let's say the VIP address of lb1 is
10.0.0.10 on the nbt-subnet with port ID
7e11e63e-7dcb-4b2c-835e-f5cd7ca79acf.  You would use "openstack
floating ip create --port 7e11e63e-7dcb-4b2c-835e-f5cd7ca79acf
external".  This will assign a floating IP to the VIP address.

Option 1 will have better performance as there is no NAT occurring
like there is with a floating IP.

Michael


On Mon, Nov 27, 2017 at 1:30 AM, Volodymyr Litovka <doka.ua at gmx.com> wrote:
> Hello colleagues,
>
> I think I'm missing something architectural in LBaaS / Octavia, thus asking
> there - how to connect Amphora agent to external network? My current lab
> topology is the following:
>
>                             +
>                             |
>                             |    +----+
>         +                   +----+ n1 |
>         |    +---------+    |    +----+
>         +----+ Amphora +----+
>         |    +---------+    |    +----+
>       m |                 n +----+ n2 |
>       g |                 b |    +----+    + e
>       m |                 t |              | x
>       t |                   |    +----+    | t
>         |                 s +----+ vR +----+ e
>         |                 u |    +----+    | r
>    +------------+         b |              | n
>    | Controller |         n |    +----+    | a
>    +------------+         e |----+ n3 |    + l
>                           t |    +----+
>                             +
>
> where "Amphora" is agent which loadbalances requests between "n1" and "n2":
>
> openstack loadbalancer create --name lb1 --vip-subnet-id nbt-subnet
> --project bush
> openstack loadbalancer listener create --protocol TCP --protocol-port 80
> --name lis1 lb1
> openstack loadbalancer pool create --protocol TCP --listener lis1 --name
> lpool1 --lb-algorithm ROUND_ROBIN
> openstack loadbalancer member create --protocol-port 80 --name n1 --address
> 1.1.1.11 lpool1
> openstack loadbalancer member create --protocol-port 80 --name n2 --address
> 1.1.1.14 lpool1
>
> Everything works (n3-sourced connections to Amphora-agent return answers
> from n1 and n2 respectively in round robin way) and the question is how to
> connect Amphora-agent to external network in order to service requests from
> outside?
>
> In example above, nbt-subnet (which is VIP network) has a virtual router
> which is connected to external network and has all abilities to provide e.g.
> floating ip to Amphora, but I see nothing in octavia config files regarding
> floating ip functions.
>
> Am I missing something? Any ways on connect Web-servers in closed
> (project's) networks with Internet using Octavia / LBaaS?
>
> Thank you!
>
> --
> Volodymyr Litovka
>   "Vision without Execution is Hallucination." -- Thomas Edison
>
>
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